The Linux Administration group is for the discussion of technical issues technical issues that arise during the administration of Linux systems, including maintaining the operating system and supporting end-user applications.

Restricting mail traffic

I have redhat linux 9, configured transparent squid proxy along
with iptables firewall. All my users acceessing their mails
through outlook and my mail server is hosted with third party.
We have pop3 and smtp address using that we are sending /
receiving mails through outlook.

I want to restrict certain users to send mail only to specified
domain like email@removed should send mail email@removed. Is't
possible through proxy? if yes, then kindly let me know the
procedure.

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